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23 Nov 2019

I’ve actually had negative caloric content. How much energy, in each of the following units, does your body lose from eating (and therefore melting) 57g of ice? Heat of fusion for water is 6.02 kJ/mol
A. Express in joules
B. Express in kilojoules
C. Express in cal
D. Express in Cal

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Deanna Hettinger
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14 Feb 2019

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Related questions

1. Ice actually has negative caloric content. How much energy, in each of the following units, does your body lose from eating (and therefore melting) 69 g of ice? Heat of fusion for water is 6.02 kJ/mol.

Part A.)Express your answer in joules

Part B.)Express your answer in kilojoules.

Part C.)Express your answer in calories (1 cal = 4.18 J).

Part D.)Express your answer in nutritional Calories or capital "C" Calories (1000 cal = 1 Cal).

2. How much ice in grams would have to melt to lower the temperature of 354 mL of water from 45 ∘C to 0 ∘C? (Assume that the density of water is 1.0 g/mL.)

Ice has negative caloric content. How much energy, in Calories does your body lose from eating (therefore melting) 105 g of ice?

The heat energy associated with a change in temperature that does not involve a change in phase is given by

q=ms?T

where q is heat in joules, m is mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g??C), and ?T is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by

q=m?H

where q is heat in joules, m is mass in grams, and ?H is the enthalpy in joules per gram.

Physical constants

The constants for H2O are shown here:

Specific heat of ice: sice=2.09 J/(g??C)

Specific heat of liquid water: swater=4.18 J/(g??C)

Enthalpy of fusion: ?Hfus=334 J/g

Enthalpy of vaporization: ?Hvap=2250 J/g

Part A

How much heat energy, in kilojoules, is required to convert 64.0 g of ice at ?18.0 ?C to water at 25.0 ?C ?

Express your answer numerically in kilojoules.

Submit

Part B

How long would it take for 1.50 mol of water at 100.0 ?C to be converted completely into steam if heat were added at a constant rate of 22.0 J/s ?

Express your answer numerically in minutes.

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